Those with certain genetic disorders that deplete skin pigment , such as albinism and xeroderma pigmentosum (a disease in which DNA repair mechanisms, especially in response to ultraviolet light, is impaired)

People who have already been treated for skin cancer

People with numerous moles, unusual moles, or large moles that were present at birth

People with close family members who have developed skin cancer

People who had at least one severe sunburn early in life

People with burns unrelated to sunburn

People with indoor occupations and outdoor recreational habits

Basal cell carcinomas and squamous cell carcinomas are more common in older people. Melanomas are more common in younger people, especially in people ages 25 to 29.